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-rw-r--r--pkgs/build-support/fetchsvn/builder.sh3
1 files changed, 2 insertions, 1 deletions
diff --git a/pkgs/build-support/fetchsvn/builder.sh b/pkgs/build-support/fetchsvn/builder.sh
index 09358aa694bc..ea52ca19fa67 100644
--- a/pkgs/build-support/fetchsvn/builder.sh
+++ b/pkgs/build-support/fetchsvn/builder.sh
@@ -22,6 +22,7 @@ fi;
 # server's certificate.  This is perfectly safe: we don't care
 # whether the server is being spoofed --- only the cryptographic
 # hash of the output matters.
-echo 'p' | svn export -r "$rev" "$url" $out
+echo 'p' | svn export ${ignoreExternals:+--ignore-externals} \
+    -r "$rev" "$url" "$out"
 
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